Boiler.



e. w. R131,

BOILER. APPLICATION FILED uovis. I916.

11 '241,-ss4. Patented Oct. 2,1917.

ww. 43M,

ATTORNEY" GEORGE W. HIST, or HAVRE,:,1VIO1\TTANA.

To all whom it may concern: 1

Be it known that I, GEORGE W. RIsT, a citizen of the United States,residing at Havre, in the county of Hill and State of Montana, haveinvented certain new and useful Improvements in Boilers, of which thefollowing is a specification.

This invention relates to boilers, and moreparticularly to a boileradapted to be used in connection with marine engines, and for similarpurposes, where it is essential to reduce the loss of heat byradiationto a mini mum.

One of the main objects of the invention is to provide a boiler .of'thecharacter stated of simple construction and operation in which theboiler proper is surrounded by a heat insulating medium which serves toeffectually prevent loss of heat by radiation. A further object is toprovide a boiler and a casing in spaced relation thereto in combinationwith a common supporting means for the casing and boiler. A furtherobject is to provide a boiler and a casing so constructed as to permitready access to the boiler for inspection, repairs and similar purposes.Further objects will appear from the detailed description.

In the drawings:

- Figure 1 is a central longitudinal vertical section through a boilerconstructed in accordance with my invention,

Fig. 2 is a section through ing on line 22 of Fig. 1.

The boiler A consists of a plurality of telescopically connectedcylindrical sections 1, 2 and 8. At each end of this boiler is securedrectangular or approximately L shape 1n cross section, being providedwith an integral inwardly directed flange 5 which is riveted to the endsection of the boiler A.

the outer cas- Intermediate the rings A are mounted two spaced rings 6and 7. The ring 6 is provided, at its inner edge, with an integralflange disposed at a right angle to the body of the ring 8. This flange8 extends between the inner end portion of the boiler section 1 and theouter end portion of the boiler SGC'. tion 2, the flange 8 and the endportions of these boiler sections being riveted tightly together so asto form a continuous fluid tight closure. The ring 7 is similarlysecured between the outer end portions of the boiler sections and theinner end portion of the boiler section 3. The vertical flangeSpecification of Letters Patent.

a supporting ring 1 which is of of the ring 6 extends between theoutwardly directed flanges 9 and 10 of the two cylindrical sections 11and 12 of the cylindrical casing B. 'The'flanges 9 and 10 of thesections of the casing, and the vertical flange of ring'6, are allsecured tightly together by meansof suitably spaced securing boltsflangeof the end ring 4.- bymeans of suite ably spaced bolts 20, a packingring or gasket 21 being interposed between these two flanges so as toform a fluid tight joint.

The vertical flange of the front'ring 4 is similarly secured to theflange 22 of the casing section 11, by means of suitably spaced bolts23. By this means the boiler A is mounted within thecasing B in spacedrelation thereto, and a' fluid tight closure isefiected at all joints,for the purposes to be later disclosed.

The section 17 of casing B is provided Patentedflct'. 2, 191 7..

App1icationfi1er1 November 8, 1916. Serial No. 130,193.

with an integral boss 24 having a central threaded aperture whichreceives a nipple 25. This nipple is connected by an elbow 26 to a pipe27. By connecting the pipe 27 to a suitableexhaust pump the air in thespace between the casing B and the boiler A may beexhausted so asto'form avacuum about the boiler. For this purpose the ver tical flangesoiithe supporting rings are each provided with a plurality of suitablyspaced apertures 28. To prevent collapse of the casing B a plurality ofsuitably spaced radially disposed reinforcing members or blocks'29 areinterposed between the boiler A and the casing. These blocks act tosupport the casing intermediate the rings thus sufliciently reinforcingthe same to prevent its collapse when the air within the casing isexhausted, and are made of asbestos, magnesia, or other heat-insulatingmaterial.

As is well known, a vacuum is one of the best of heat insulators. Bysurrounding the .minimum, thus effecting a material saving in the costof fuel consumed to produce a given amount of power, and producing aboiler of simple construction and high efliciency. Then it is desired torepair the boiler, the casing B may be removed by the simple expedientof removing the securing bolts which secure the sections of the casingto the supporting rings. This provides simple means whereby the boilermay be quickly and easily inspected or repaired.

The casing 13 is further provided with an integral boss 30. A nipple 31is threaded into this boss and communicates with an outwardly openingescape valve 32. This valve is provided to prevent explosion of thecasing B in the event of the boiler springing a leak. In this case thesteam which would ordinarily collect within the casing B so as to causeexplosion of the same will act to open the valve 32 and escape throughthe same into the atmosphere In this manner the valve acts as a safetydevice and also as a visual signal or indicator to give warning of aleak in the boiler A.

As is clearly shown in Fig. 2 of the drawings, each of the sections ofthe boiler casing is formed of two members of semi-cylindrical shape,each of these members being provided at its edge with an integraloutwardly directed longitudinally extending flange. The flanges of theupper one of these members hit on the flanges of the lower member, thetwo members being then detachably secured together by bolts passedthrough alined apertures in the flanges, suitable securing nuts beingthreaded on these bolts. To insure a fluid tight closure bea tween themembers of each section, a suitable packing member is interposed betweenthe securing flanges, as shown, this packing member corresponding to thegaskets secured between the flanges at the ends of the sections of thecasing and the supporting rings. By this construction, the casing can1,2a1,sse

and a casing mounted about the boiler in spaced relation theretocomposed of a plurality of sections, each of said sections beingprovided at each end with an outwardly directed integral flange, saidflanges being secured to the vertical arms of the said rings. I

2. The combination of a boiler composed of a plurality of telescopicallyconnected sections, a plurality of rings mounted about the boilerconcentric therewith, said rings being of approximately L-shape in crosssec-- tion, and certain of said rings having their inner arms securedbetween the overlapping ends of adjacent sections or" the boiler,certain others of said rings having their inner arms secured to the endsections of the boiler, a casing composed of a plurality of sectionsmounted about the boiler in'spaced relation thereto, each of saidsections being provided at each end with an outwardly di rected integralflange and means for detachably securing the sections of the casing tothe vertical arms of the said supporting rings.

In testimony whereof I afiix my signature in presence of two witnesses.

GEORGE W. RIST.

Witnesses:

C. B. ELWELL, Mrs. O. J. Hmzs'r.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. C.

